If he were paying enough attention to his own self at the moment, the Doctor might question why it is that he's suddenly holding his breath far longer than is necessary, while Vanessa caresses perilously close to his lips.

Of course, he can hold his breath a remarkably long time, far longer than humans, but for the moment, he seems to be held in stasis by the promise of her touch alone. To take a breath now, even just the slightest movement, might cause her to pull away, or - dangerously - to draw closer. No, no, best not to move then. Better not to risk it either way. The kiss to his cheek is pleasantly soft and sweet, but then he's already moving on to the promise of cake, the safest and easiest treat to consider partaking in at the moment.

Though he does allow her to pull away now, simply for the sake of this promised sweet, his hand only parts from hers with a final kiss. There, now he's sated so he'll drop her hand and move to follow her.

"Always my motto of course! Why put off anything good when you can have it now," he grins. Truly, he's only speaking of the cake, though perhaps if thought at with any length, his words could have a double meaning he remains unaware of for now.